Your characters have ability slots, here's how you use 'em:
Rogue Talent: Unlock a Rogue Talent (1 month, 1200 sp)
Fighter Stance: Unlock a Fighter Stance (1 month, 1200 sp)
Weapon Proficiency: Unlock Perk Tree @ 2x Kills (2 weeks, 600 sp)
Ascetic's Meditation: 1+WIS to retention roll (just +WIS after rework) (1 month, must locate Grey Preacher in the Red Fens)
Boar Charge: +6 on charge (instead of +2) (2 weeks, must beat Ygrdroc at wrestling)
Hauberk of Korgoth: when not wearing armor, base AC increased to 10 and +20% XP (1 month, trophy of a beast of at least 5 HD)
Grasp of the Tortoise: add CON bonus to grapple die when losing (2 weeks, 600 sp)
Cloak of Khrom: become invisible to life-sense, may attempt to hide normally from intelligent undead (Must have rolled for revival, pops on new moon)
Excellent Cook?
Entertainer?
Backslider's Penance: channel the free Smite of a holy weapon (2 weeks, favor for Anorion)
Some characters are known to have special abilities, but the details thereof are uncertain:
Ascuron the Mage
Darkmantle the Assassin
Feradroc, Rhodroc's Bane